initialisation confusion

[Rajat Sarkar]

class Dog
{
private int teeth_number;
private boolean isMad;
private String name;
private int size;

public Dog(String s,boolean ad,int si)
{
name=s;
isMad=ad;
size=si;
}

public String showName()
{
return name;
}

public int showteeth()
{
return teeth_number;
}
}

public class TestDog
{
public static void main(String[] args)
{
Dog mydog=new Dog("Rocky",false,50);
System.out.println("name : "+mydog.showName()+" teeth number : "+mydog.showteeth());
}
}

In the Dog's constructor we don't initialise teeth_number.Then how we get the value 0 for it when we create Dog object?

[Campbell Ritchie]

All fields have a default value: in the case of numbers 0. This doesn't apply to local variables.